I disagree. He's using a acoustical bandpass in the crossover, that if implemened electrically would require insanely huge components for one, hence the reason to do it in DSP. A two way, yes very doable. Three way, I dunno.
Yup, that's the place. Tom, a custom XLR with the parts integrated might be the way to go, as opposed to a box that then requires a second pair of cables.